ggdist: Make a Raincloud Plot to Visualize Distribution in ggplot2
Written by Matt Dancho on July 22, 2021
ggdist package is a
ggplot2 extension that is made for visualizing distributions and uncertainty. We’ll show see how
ggdist can be used to make a raincloud plot.
This article is part of R-Tips Weekly, a weekly video tutorial that shows you step-by-step how to do common R coding tasks.
Here are the links to get set up. 👇
For those that prefer Full YouTube Video Tutorials.
Learn how to use
ggdist in our 7-minute YouTube video tutorial.
What is a Raincloud Plot?
The Raincloud Plot is a visualization that produces a half-density to a distribution plot. It gets the name because the density plot is in the shape of a “raincloud”. The raincloud (half-density) plot enhances the traditional box-plot by highlighting multiple modalities (an indicator that groups may exist). The boxplot does not show where densities are clustered, but the raincloud plot does!
Raincloud Plot (We'll make in this tutorial)
We’ll go through a short tutorial to get you up and running with
ggdist to make a raincloud plot.
Raincloud Plots with
This tutorial showcases the awesome power of
ggdist for visualizing distributions.
This tutorial wouldn’t be possible without another tutorial, Visualizing Distributions with Raincloud Plots by Cédric Scherer. Cédric truly a ggplot2 master. Follow Cédric Scherer on Twitter to learn more about his excellent visualization work.
Before we get started, get the R Cheat Sheet
ggdist is great for extending ggplot2 with distributions. But, you’ll need to learn
ggplot2 to take full advantage. For these topics, I’ll use the Ultimate R Cheat Sheet to refer to
ggplot2 code in my workflow.
Download the Ultimate R Cheat Sheet. Then Click the “CS” hyperlink to “ggplot2”.
Now you’re ready to quickly reference the
ggplot2 cheat sheet. This shows you the core plotting functions available in the ggplot library.
Onto the tutorial.
Load the Libraries and Data
First, run this code to:
- Load Libraries: Load
- Import Data: We’re using the
mpgdataset that comes with
Raincloud Plot: Using ggplot
Next, we’ll make a Raincloud plot that highlights the distribution of Vehicle Fuel Economy (MPG) by Engine Size (Number of Cylinders). It helps if you have
ggplot2 visualization experience. If you are interested in learning
ggplot2 in-depth, check out our R for Business Analysis Course (DS4B 101-R) that contains over 30-hours of video lessons on learning R for data analysis.
Make the ggplot2 canvas
The first step is to make the
ggplot2 canvas. We:
Prep the Data: Using
filter()to isolate the most common (frequent) vehicle engine sizes
Map the columns: Using
ggplot(), we map the cyl and hwy column. We also make a transformation to convert a numeric cyl column to a discrete cyl column with
This produces a blank plot, which is the first layer. You can see that the x-axis is labeled “factor(cyl)” and the y-axis is “hwy” indicating the data has been mapped to the visualization.
Add the Rainclouds with
Next, we add our first geometry layer using
ggdist::stat_halfeye(). This produces a Half Eye visualization, which is contains a half-density and a slab-interval. We remove the slab interval by setting
.width = 0 and
point_colour = NA. The half-density remains.
And here’s the output. We can see the half-denisty distributions for fuel economy (hwy) by engine size (cyl).
Add the Boxplot with
Next, add the second geometry layer using
ggplot2::geom_boxplot(). This produces a narrow boxplot. We reduce the
width and adjust the opacity.
And here’s the output. We now have a boxplot and half-density. We can see how the distributions vary compared to the median and inner-quartile range.
Add the Dot Plots with
Next, add the third geometry layer using
ggdist::stat_dots(). This produces a half-dotplot, which is similar to a histogram that indicates the number of samples (number of dots) in each bin. We select
side = "left" to indicate we want it on the left-hand side.
And here’s the output. We now have the three main geometries completed.
Making the plot look professional
We can clean up our plot with a professional-looking theme using
tidyquant::theme_tq(). We’ll also rotate it with
coord_flip() to give it the raincloud appearance.
We’ve just finalized our plot. We can see clearly that the distribution of the 6-cylinder is bi-modal, something you can’t tell with an ordinary boxplot. We should investigate why there are so many dots in 6-cylinder with low highway-fuel economy. We’ll save that for another R-Tip.
We learned how to make Raincloud Plots with
ggdist. But, there’s a lot more to visualiztion.
It’s critical to learn how to visualize with
ggplot2, which is the premier framework for data visualization in R.
If you’d like to learn
ggplot2, data visualizations, and data science for business with R, then read on. 👇
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